1 /* $NetBSD: tea5757.c,v 1.1 2002/01/01 21:51:40 augustss Exp $ */ 2 /* $OpenBSD: tea5757.c,v 1.2 2001/12/06 16:28:18 mickey Exp $ */ 3 4 /* 5 * Copyright (c) 2001 Vladimir Popov <jumbo@narod.ru> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* Implementation of most common TEA5757 routines */ 30 31 /* 32 * Philips TEA5757H Self Tuned Radio 33 * http://www.semiconductors.philips.com/pip/TEA5757H 34 * 35 * The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit. 36 * The radio part is based on the TEA5712. 37 * 38 * The TEA5757 is used in FM-standards in which the local oscillator 39 * frequency is above the radio frequency (e.g. European and American 40 * standards). The TEA5759 is the version in which the oscillator frequency 41 * is below the radio frequency (e.g. Japanese standard). 42 * 43 * The TEA5757; TEA5759 radio has a bus which consists of three wires: 44 * BUS-CLOCK: software driven clock input 45 * DATA: data input/output 46 * WRITE-ENABLE: write/read input 47 * 48 * The TEA5757; TEA5759 has a 25-bit shift register. 49 * 50 * The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000, 51 * Gemtek PCI cards and most Mediaforte FM tuners and sound cards with 52 * integrated FM tuners. 53 */ 54 55 #include <sys/param.h> 56 #include <sys/radioio.h> 57 58 #include <dev/ic/tea5757.h> 59 60 /* 61 * Convert frequency to hardware representation 62 */ 63 u_int32_t 64 tea5757_encode_freq(u_int32_t freq) 65 { 66 #ifdef RADIO_TEA5759 67 freq -= IF_FREQ; 68 #else 69 freq += IF_FREQ; 70 #endif /* RADIO_TEA5759 */ 71 /* 72 * NO FLOATING POINT! 73 */ 74 freq *= 10; 75 freq /= 125; 76 return freq & TEA5757_FREQ; 77 } 78 79 /* 80 * Convert frequency from hardware representation 81 */ 82 u_int32_t 83 tea5757_decode_freq(u_int32_t freq) 84 { 85 freq &= TEA5757_FREQ; 86 freq *= 125; /* 12.5 kHz */ 87 freq /= 10; 88 #ifdef RADIO_TEA5759 89 freq += IF_FREQ; 90 #else 91 freq -= IF_FREQ; 92 #endif /* RADIO_TEA5759 */ 93 return freq; 94 } 95 96 /* 97 * Hardware search 98 */ 99 void 100 tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir) 101 { 102 u_int32_t reg; 103 u_int co = 0; 104 105 reg = stereo | lock | TEA5757_SEARCH_START; 106 reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN; 107 tea5757_hardware_write(tea, reg); 108 109 DELAY(TEA5757_ACQUISITION_DELAY); 110 111 do { 112 DELAY(TEA5757_WAIT_DELAY); 113 reg = tea->read(tea->iot, tea->ioh, tea->offset); 114 } while ((reg & TEA5757_FREQ) == 0 && ++co < 200); 115 } 116 117 void 118 tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data) 119 { 120 int i = TEA5757_REGISTER_LENGTH; 121 122 tea->init(tea->iot, tea->ioh, tea->offset, 0); 123 124 while (i--) 125 if (data & (1 << i)) 126 tea->write_bit(tea->iot, tea->ioh, tea->offset, 1); 127 else 128 tea->write_bit(tea->iot, tea->ioh, tea->offset, 0); 129 130 tea->rset(tea->iot, tea->ioh, tea->offset, 0); 131 } 132 133 u_int32_t 134 tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq) 135 { 136 u_int32_t data = 0ul; 137 138 if (freq < MIN_FM_FREQ) 139 freq = MIN_FM_FREQ; 140 if (freq > MAX_FM_FREQ) 141 freq = MAX_FM_FREQ; 142 143 data = tea5757_encode_freq(freq) | stereo | lock | TEA5757_SEARCH_END; 144 tea5757_hardware_write(tea, data); 145 146 return freq; 147 } 148 149 u_int32_t 150 tea5757_encode_lock(u_int8_t lock) 151 { 152 u_int32_t ret; 153 154 if (lock < 8) 155 ret = TEA5757_S005; 156 else if (lock > 7 && lock < 15) 157 ret = TEA5757_S010; 158 else if (lock > 14 && lock < 51) 159 ret = TEA5757_S030; 160 else if (lock > 50) 161 ret = TEA5757_S150; 162 163 return ret; 164 } 165 166 u_int8_t 167 tea5757_decode_lock(u_int32_t lock) 168 { 169 u_int8_t ret = 150; 170 171 switch (lock) { 172 case TEA5757_S005: 173 ret = 5; 174 break; 175 case TEA5757_S010: 176 ret = 10; 177 break; 178 case TEA5757_S030: 179 ret = 30; 180 break; 181 case TEA5757_S150: 182 ret = 150; 183 break; 184 } 185 186 return ret; 187 } 188